Sun-heat motor



Dec. 16, 1930. T. RoMAGNoLl 1,785,651

` sux HEAT xo'ron Filed Hay 17, 1928 2 Sheets-Sheet 1 I Fiq.1

Dec. 16,1930. T. RoMAG'NoLI 17353551 SUN HEAT MOTOR Filed Hay 17, 1928 2Sheets-Sheet 2 Patented Dec. 16, 1930 PATENT OFFICE Trro aomGNoLI, orromena, ITALY SUN-HEAT IOTOB Application led lay 17, 1928, Serial No.278,603, and in Italy lay 21', 1927.

The present invention relates to installations intended to recover sunheat and to convert it into motive force by the intermediate of anoperating medium which is alternately 5 in liquid state and in vapourstate and whose pressure is exhausted in an engine.

This invention comprises a set of this kind in which the engine isenclosed within a sealed chamber where vthe operating medium is storedin liquid state and a fluid which has absorbed sun heat is 'caused toimpart its heat to said operating medium. This invention provides meansfor sealing the chamber 'wherethe operating medium is in vapour'state bymeans of a lubricant which lills the bottom of said chamber and sealsthe packing gland of the engine, while means areprovided for therecovery of said lubricant'.

This invention comprises further features directed to secure asatisfactory operation of the set.

On the annexed drawing is shown by way of example an embodiment of thepresent invention and Figure 1 is a diagrammatical and fragmentaryvertical section of a complete set;

Figure 2 is a diagrammatic section with parts removedand intended todisclose means directed to seal the piston and packing gland of theengine; Y

Figure 3 is a fragmentary section to an enlargedA scale of the bottomportion of the engine, this figure being reversed from the 35 showing inFigures 1 and 2;

Figure 4 shows in vertical fragmentary section the lower portion of theengine casgIhe installation shown in Figure 1 com- *U rises a heatabsorber intended to collect sun iieat and which consists'of a closedreceiver 1 of sheet metal arranged under a suitable inclination tocollect sun radiations; tubes 2 and 3 lead from the top and bottom endsof said absorber 1 to a heat exchanger or va rizer hereinafter describedin which a uid 1 heated in heat vabsorber limparts heat tol operatingmedium. v I t Said vaporizer comprises a metal recelver 5 '4 in which islocated a concentric hollow casreceiver 4 a top chamber 10 in whichopens 60 tube 2; at their bottom ends tubes 8v extend through a flange5" of casing 5 and open within space 5 which is closed at itsbottom by aflangepl of the engine casing A tube 11 leads from top portion of cham-55 ber5 to the suction side o a rotary pump 12 whose pressure side isconnected with pipe 3; the said pum 12 is driven by sun-heat en-l gineas hereina er described and causes the heat absorbing fluid to circulatethrough ab- 70 sorber 1, tube 2, chamber 10, tubes 8, s ace 5', pipe 11,pump 12, tube 3 and again to eat absorber as shown by arrows. Y

Under receiver 4 is located a crank case 13 having `flange 13 whichcloses the bottom end 75 of receiver 4 and supports it; in the wall ofsaid case 13 is journalled a crank shaft 14 having a crank pin 14 aneccentric 71 and further crank members 79-80; the crank in 14 of saidcrank shaft is connected by r 1 7 80 and stem 72 with the piston 16 ofthe driving engine while eccentric 71 actuates its slide'distributoNlS;crank members 79-80 are intended to\actuate the piston 58' of a furtherpump 25 shown'in Figure 3 and hereinafter S5 i described, and itsdistributor 57. v

The engine comprises a cylinder 15 located inside drum 7, and havinginclined top and bottom heads, and piston 16 reciprocating in saidcylinder has similarly inclined top and 00 `bottom faces.

Inlet ports 81-82 of the contact or sliding surface of the slidedistributor 18 open freely within drum7 while the slide 18'is arranged fand actuated to connect each chamber of the 95 cylinder 15 andrespective ports 81--82, when said chamber is in' exhaust conditions,with recesses 83 and tube 20 connected with said recesses and leadingtoa condenser for the operating medium, ashereina-fter described. 10

Said condenser comprises a receiver 21 in which is enclosed a casing 76providing in said receiver, spaces 22 and 77, the bottom wall 84 of saidcasing providing a further A chamber 75; tubes 23 are inserted throu hthe top Wall 76 and bottom one 84 of casing 76 to provide for acirculation of cooling medium through condenser space 77 in which opensthe exhaust tube leading from engine cylinder.

A tube 24 collects the condensate within space 77 and leads it to thesuction side of a pump 25 hereinafter described and illustrated indetail in Figure 3 Whose pressure side discharges through a tube 26 intospace 73 and thence through port 73 into chamber 6 where the operatingvmedium is vaporized as hereinafter described.

Said pump 25 is located in space 73 and comprises a piston 58 driven byrod 60 and eccentric 80 solid with crank shaft 14, and a reciprocatingdistributor 57 controlled by rod J59 and crank pin 79.

The crank shaft 14 has solid therewith a fiywheel 27 and a pinion 29which drives a gear wheel 30 solidwith shaft 31 of pump 12 abovereferred to. l

Said gear wheel has an eccentric pin 74 which actuates by means of rod67 andstem 67 the piston (not shown) of pump 32 intended to cause acooling liquid to fiow from any source of fluid through tube 3, space75,

tubes 23, space 22, valve 69 and tube 68 to disusual.

The piston 16 of the engine is mounted to reciprocate in cylinder 15 andhas inclined top and bottom faces, similar to top and bottom cylinderheads. t

Said piston is provided with packing rings 78 and with al groove 36intermediate-them, which communicates through the port 85, hollow stem72, port 86 and chamber 87 provided in the cylinder head 88 with a tube34 which o ens in space 73-this space communieating urther b means ofpassage 63 with groove 64 of reciprocating distributor 57 of pump 25(see Figure 3).

The packing gland 28 for the passage of shaft 14 through the wall of thecrank case 13,

-this being the single packing gland of the machine, is shown in detailin Figure 2 which also shows means for introducing lubricant in theengine.

Said packing gland comprises a packing material 89 divided into threesections by two intermediate grooved and perforated collars 38 and 39;the groove of collar 38 communicatesby means of tube 40 with a receiver41 arranged within the drum 7 above cylinder l15 and having a port 41opening in the tom of the drum 7 and has at its outlet therein a head 49havin a restricted hole, while at its outer end sai tube carries afittiug48 closed by a removable plug 51.

An orlce 53 is provided in the bottom end of casing of pump 25 (Figure3) and is closed by a plug 53', a ball valve 54 being located in saidorifice; said orifice is adapted for connection with a tube 89 leadingfrom a vacuum producing pump which tube has for connection with orifice53 a fitting 90 having a stem 91 loosely entering said orificeandremoving the ball valve 54 from its closed position when said fittingis screwed home in the orifice 53.

The suction side of pump 25 has a further orifice 65 having a ball valve66 and a removable plug 65; these means are intended for connecting theoperating medium circuitl with a bottle, as 56, containing operatingmedium when it is desired to introduce the charge of operating medium inthe engine.

To put the set vin condition for operation the heat absorber 1 and tubes2 and y3 with spaces connected therewith are filled with water; a vacuumproducing machine (not shown) is connected with orifice 53 after plug 53has been removed, and a vacuum is produced in the engine through tube26, the plug g3 being thereafter screwed home on its ori A lubricantisintroduced in the case 13, space 73 and bottom portion of drum 7; alubricant is used having high viscosity and larger density than theoperating medium used in the engine, and unable to dissolve therein.

Then a charge of o erating medium is introduced by means-o a bottle 56connected with orifice 65 after removing plug 65.

The pressure of the fluid Within. the bottle shifts off ball valve 66and thereafter the plug 65, is again inserted in position. The charge ofoperating medium thus introduced must be sufficient to fill space 6,drum 7 and space 77 of condenser 21, with operatin ly at'the state ofvapour and state of liquid.

. In the drawing, line 92 indicates the level of the operating medium atliquid state in the space/6 and in the drum 7, and line 93 indipartly inthe o' medium partill der sucha pressu cates the level of the liquidoperating medium in the condenser 77.

Line 94 indicates the level of the lubricant in the space i and drum 7,line 95 is the level of lubricant Vin the receptacle 41, and line 9G isthc level of lubricant in the condenser 77.

(irlycerine may be used as lubricant and methyl chloride or anothersubstance having a similar character may be used as operating medium. l

ln operation the beat absorbingr liquid heated byI sun radiation in heatabsorber 1 I'iows through tube 2, space 10, tubes 8, chamber 5', tube11, pump 12 and is returned to absorber 1 through tube 3,' in saidcirculation it imparts heat to operatingmedium collected withiu space 6which vaporizes and enters alternately either of the ports S182 andcooperating chambers of cylinder under the control of the distril'iutor18.

The vaporized operating medium thus eX- hausts its pressure on thepiston and moves it in cooperation with connecting means kand shaft- 14,and then it is discharged by slide distributor 18 and tube 20 tocondenser 77 where it is condensed for further operation.

Shaft 14 drives pump 12 which promotes the circulation of heatabsorbingfluid and also pump 32 which causes the flow of a coolingmedium through tube 33, space 75, condenser tubes 23 and outlet 68;further said shaft ,14 drives pump 25 which draws condensed operatingmedium from tube 24 and condenser 7 7 and conveys it into space 73.

Then operating medium moves up through the mass of heavier lubricantstored therein and unable to mirr with it, and it flows through port73', into space 6 for further vaporization and operation.

The described operation of the parts is maintained until heat absorbingfluid imparts heat to chamber 6 and operating medium lo'- cated therein;the balance of power over that required to actuate the several servicepumps may be availed of for any useful purpose.

In operation it is useful to locate an amount of lubricant in condenser77 to reach the lower level of the lnouth of tube 24 in said condenser;lubricant is alsoI located in drum 7 to reach the bottom port 82 ofcylinder, suitable connections leading to outside and provided with sealplugs (not shown) being provided for such purpose.

The lubricant entering the engine cylinder 15 is easily dischargedtherefrom during the exhaust period owing to the slope of the cylinderheads and of the piston faces.

The lubricant is also operative in securing the seal ofthe severalmembers of the engine. This feature depends on the fact that thelubricant store-din drum 7 is subject to the'hightest pressuref'f'tlllecycle this being the pres `sure of vapours of operating medium withinthe chamber 6 and top portion of drum 7; un-

cant is detected.

lubricant is forced through tube 34, chamber 87, port 86, hollow stem72, andport tothe groove -lli'of piston 1G and therefore it. acts toprevent leakages of vapours of operative fluid from the cylinderlDistributor 57 of pump 25 is also supplied with lubricant under pressureinto its groove ($4 through passage 63 provided in said distributor andopening in space 73 and in said groove.

The seal and lubricant recovery in packing gland 28 is secured by thefact that in space 38 the same pressure is operative as that actmel inthe drum 7 because said space 38 is connccted by tube 40 with receiver41 which contains lubricant under the vapour pressure acting thereinthrough orifice 41. while in chamber 39 the atmospherical pressureis-operative; therefore lubricant tends to flow from space 38 to space39 and is therein collected and delivered therefrom by means of tube 42to the recovery receiver 43 which is also under atmospherical pressureby its vent 44.

Lubricant escaping from .the engine and collecting in the receiver 43 isagain introduced into the receiver 41 by opening valve 47 andmanipulating the hand operated pump 45 whose suction side is connectedwith receiver .A3 while its pressure side is connected with valve 47 andtube 40 leading to receiver 41.

Said pump is also used to introduce the charge of lubricant in thereceiver 41.

The amount of lubricant existing in receiver 4l is easily detected bythe manipula tion of pump 45 because when receiver 41 is not filled inwith lubricant said pump is easily actuated the escape of vapourstherefrom bcing easy through port 41.

On the contrary a. large resistance is found against the pump actuationwhen lubricant has illed receiver 41 and is .issuing through orifice 41.l

To ascertain whether lubricant is at correct vlevel in the drum 7 andparts connected therewith, the plug 51 closing tube 48 is 1emoved.

Then, when the lubricant level is under the orifice of tube head 49 anescape of vapour is found, while when lubricant level is above head 49 aslow and small leakage of lubril Of course the means for recovery oflubricant may be omitted and then a supply of lubricant is to beintroduced from time to time into the engine to substitute for leakages.

lVhat I claim as my invention and desire to secure by United StatesLetters Patent is 1. A sun heat operated motor 'comprising a heatabsorber, a heat exchanger, a fluid, means for circulating said fluidthrough said heat absorber and exchanger, said heat exchanger providinga sealed vaporizing chamber containing a bottom layer of lubricant and asupernatant body of operating medium, an

engine' cylinder extending in saidvaporizirg la'n chamber and havingports opening therein, a piston reciprocating in said cylinder, a crankshaft and a connecting rod operated by said piston, said crank shaftbeing journalled in said vaporizing chamber, an exhaust duct, a-

distributor operated by said .crank shaft and controlling said cylinderports for timed communication of the `same with said vaporizing chamberand said exhaust duct, a condenser connected with said exhaust duct,means for cooling said condenser and means conveying condensed operatingmedium from -l`said condenser to said vaporizing chamber.

2. A sun heat operated motor comprising a heat absorber, a heatexchanger, a fluid, means for circulating said fluid through said heat'absorben and exchanger, said heat cx'- changer providing a sealedvaporizing chainber containing a bottom layer of lubricant andasupernatant body of operating mcdium, an ,engine cylinder extending insaid vaporizing chamber and having ports open- Ving therein, a pistonreciprocating in said cylinder and having an annular groove intermediateits ends, means for leading lubricant from said vaporizing chamber tosaidr piston groove, a crank shaft and a connecting rod operated by saidpiston said crank shaft being journalled in said vaporizing chamber, anexhaust duct, a distributor operated by said crank shaft and controllingsaid cylinder ports for timed communication of the samek With saidvaporizing chamber and said exhaust duct, a condenser connectedl withsaid exhaust duct, means for cooling said condenserand means forconveying condensed operating medium from said condenser to saidvaporizing chamber.

3. Asun heatoperated motor comprising heat absorber, a heat exchanger, a`fluid, means for circulating said fluid through l saidjheat absorberand exchanger, said heat exchanger providing a sealed vaporizing'chamber containing a bottom layer of lubricant and a supernatanbbody ofan operating medium, an engine cylinder extending in said vaporizingchamber and having ports opening therein, a piston reciprocating in Ysaid cylinder, the end faces of saidcylinder and piston being inclinedtowards said ports, a crank shaft and a connecting rod operated by -saidpiston, said crank shaft being journalled in said vaporizing chamber, anexhaust duct, a distributor operated by said crank shaft and controllingsaid cylinder ports for timed communication of thesame,

with said vaporizing chamber and said' cxhaust duct, a condenserconnected with said exhaust duct, means for cooling said condenser andmeans conveying condensed operating medium from said condenser to saidvaporizing chamber.

4. A sun heat operated motor comprising a heat absorber, aheatexchanger, a fluid, means for circulating said fluid through'saiding therein, a piston reciprocating in said cylinder, a crank shaft anda connecting rod operated .by said means for journalling said crankshaft in said vaporizing chamber, a packing gland for saidshaftjournalling means providing spaces in said packing gland, meanssupplying lubricant lunder pressure of vapor-ized operating medium tothat of said spaces which is adjacent to said f: porizing chamber, anouter reservoir, means connecting the one of said spaces adjacent tooutside with said reservoir, an exhaust duct, a distributor operated bysaid crank shaft and lcontrolling said cylinder ports for timedcommunication of the same with said vaporizing chamber and said exhaustduct, a

condenser connected With saidexha'ust duct,

yandra supernatant body of an operating medium, an engine cylinderextending in said vaporizing chamber and having ports opening therein, aiston reciprocatlng in said cylinder, a cran shaft and a connecting rodoperated by said piston, a journal for s'aid crankshaft in saidvaporizing chamber, a packing gland for said shaft journal, meansproviding spaces in said packing, gland. means supplying lubricant underpressureo' said vaporized operating medilunto that ol' said spaces whichis adjacent to said vaporizing chamber, an outer reservoir, means con,-necting the one of said spaces adjacent to outside With said reservoir,a pump connected with said reservoir, means connecting the outlet oflast named pump' with said vaporizing chamber, an exhaust duct, adistributor operated by said crank shaft and controlling said cylinderports for. timed communication of the same with said vapormeans forcirculating said fluid through said heat absorber and exchanger, saidheat exchanger providmg a sealed vaporizing chamber contalnlng a bottomlayer of lubripacking gland, a receptacle in said operating mediumvaporizing chamber and opening therein at its top, said receptacle con-ltaining lubricant, a tube connecting the bot- /tom of said receptaclewith the one of said l Spaces of the packing gland adjacent to saidvaporizing chamber, an outer reservoir and vmeans connecting saidreservoir with the one of 'said packing gland spaces adjacent tooutside, means for introducing lubricant in said receptacle, an exhaustduct, a distributor operated by said crank shaft and controlling saidcylinder ports for timed communication of the same with said vaporizingchamber and exhaust duct, a condenser connected with said exhaust duct,means for cooling said condenser and means conveying 'condensedoperating medium from said condenser to said vaporizing chamber.

7 A sun heat operated motor comprising a heat absorber, a heatexchanger, a fluid,

means for circulating said fluid through said heat absorber andexchanger, said heat exchanger' providing a sealed vaporizin chambercontaining a bottom body of lu ricant 35, and a supernatant body of -anoperating medium, an engine cylinder extending in said vaporizingchamber and having ports opening therein, a piston reciprocating in saidcylinder, a crank shaft and a connecting 40 rod operated by said piston,a journal for said crank shaft in said vaporizing chamber, a packinggland or said shaft journal,

means providing spaces insaid packingA gland, a receptacle in saidoperating medium 4.5 vaporizing chamber and opening therein through atop restricted orifice, said'receptacle containinga lubricant,` a tubeconnecting the bottom of said receptacle withthe one of said spaces insaid -packing `gland adjacentfto the vaporizing chamber wall, an

outer reservoir, means connecting said reservoir with the one of saidpacking gland spaces adjacent to outside, a pump having its inletconnected with said outer reservoir '55 and its outlet connected withsaid receptacle,

an exhaust duct, a distributor operated by -said crank shaft andcontrolling said cylinder ports for timedcommunication of the same withsaid vaporizing chamber and exm haust duct, a condenser connected withsaid .Y exhaust duct, means for cooling said condenser and meansconveying condensed operating medium from said condenser' to saidvaporizing chamber.

8. A sun heat operated motor comprising a heat absorber, a heatexchanger, a uid, means for circulating said fluid through said heatabsorber and exchanger, said heat exchanger providing a sealedvaporizing chamber containing a bottom layer of lubricant and asupernatant body of operating medium, an engine cylinder extending insaid chamber and having ports opening therein, a piston reciprocating insaid cylinder, a crank shaft and a connecting rod operated by saidpiston said crank shaft being journalled in said vaporizing chamber, anexhaust duct, a distributor operated by. said crank shaft andcontrolling said cylinder ports for timed communication of the same withsaid vaporizing chamber and exhaust duct, a condenser connected withsaid exhaust duct, means for cooling said condenser, a pump driven bysaid crank shaft, said pump being located in said vaporizing chamerunder the level of lubricant therein, said pump drawing operating mediumfrom said condenser after its condensation and conveying it into saidvaporizing chamber for repeated vaporization and operation. 9. A sunheat operated motor comprising a heat absorber, a heat exchanger, afluid, means for circulating said fluid through said heat absorber andexchanger, said heat exchanger providing a sealed vaporizing chambercontaining a bottom'body of lubricant and a supernatant body of anoperating mediuman said vaporizing chamber, an exhaust duct, a

distributor operated by said crank shaft and controlling said cylinderports for timed communication of the same with said vaporizing chamberand exhaust duct, a lcondenser connected with said exhaust duct, meansfor coolin said condenser and a by sai crank shaft and located 1n saidvaporizingy chamber under the level of lubricant therein, ysaid pumglverating medium om said condenser and conveying -it into said vaporizingchamber, and said pump having a distributor provided with a groove and apassage leading to said groove from said va orizing chamber to supplylubricant in sai groove under the pressure of vaporized operatingmedium. y

10. A sun heat operated motor comprising a heat absorber, a. heat exchanr, a Hui means for circulating said fluid t rough said heat absorber andexchanger, said heat exchanger providing a sealed va rizin chambercontaining a bottom b yof lu ricant and a supernatant body of anoperating me-i dium, a tube vopening in said vaporizing. chamber througha restricted orifice and leading to outside, means for sealing theoutlet of sald tube and for opening it t0 ascertain the pump drivendrawing condensed opengine cylinder extending in said vaporizing newlevel of lubricant in said vaporizing chamber by the leakage throughsaid orifice and tube when said sealing means are open, an enginecylinder extending in said chamberv and having ports opening therein, apiston reciprocating in said cylinder, a crank shaft and a connectingrod operated by said piston said crank shaft being ournalled in saidVaporizing chamber, an exhaust duct, a distributor operated by saidcrank shaft and controlling said cylinder ports for timed communicationof the same with said vaporizing chamber and exhaust duct, a condenserconnected with said exhaust duct, means for cooling said condenser andmeans conveying condensed operating medium from said, condenser to saidvaporizing chamber. A

11. A sun-heat operated motor comprising a heat absorber, a receiver, acasing in said receiver, a drum in said casing, tubes extending in saidcasing intermediate said casing and drum and opening in said receiver, aheat absorbing iiuid; a pump for circulating said heat absorbing fluidthrough said heat absorher, tubes and casing, an engine cylinder locatedin said drum and having ports opening therein, an exhaust duct, adistributor controlling the timed communication of said cylinderportswith the space inside said drum and said exhaust duct, a pistonreciprocating in said cylinder, a piston rod, a crank case supportingsaid casin and drum and communicating with space inside said casing anddrum, a crank shaft mounted in said crank' case, crank means on saidcrank shaft connected with said piston rod and actuating saiddistributor, al condenser connected with said exhaust duct, means forcooling said condenser, said crank case casing and drum containing alubricant and a supernatant body of operating medium, a pump drawingcondensed operating vmedium from said condenser and conveying itto saidcrank case and casing and drum, means for actuating by said crank shaftsaid heat absorbing fluid circulating pump, condensed operatingmediumconveying pump and condenser cooling means, a receptacle in said drumopening therein through a restricted orifice, means leading lubricantunder pressure of vaporized medium from said receptacle to crank shaftsupporting means in said crank case, means :I'orl collecting lubricantleaking from said crank shaft supporting means, means for forcing saidcollected lubricant to said receptacle, means for introducing operatingmedium in said drum and means for supplying lubricantv under thepressure of vaporlzed operating medium to moving parts of said engineand condensed operating medium pump.

- 12. A sun heat operated motor comprising a heat absorber, a receiver,a casing in said receiver, a drum 1n said casing, tubesextend- 6 insaidcasing intermediate' said casing casing and drum, a crank sha anddrum and opening in said receiver, a heat absorbing iuid, a pump forcirculating said heat absorbing fluid through said heat absorber, tubesand casing, an engine cylinder located in said drum and having portsopening therein, an exhaust duct, a distributor controlling the timedcommunication of said cylinder ports with the space inside said drum andsaid exhaust duct,a piston reciprocating in saidcylinder, a piston rod,a crank case supporting said casing and drum and communicating with thespace inside said casing and drum, a crank shaft supported in said crankcase, said crank shaft being connected with said piston rod and havingcrank means operating said distributor, a condenser cony natant body ofoperating medium, a pump yconveying condensed operating medium from saidcondenser to said crank case casing and drum, means for actuatlng saidheat absorbv ing pump, condensed operating medium fluid circulating pumpand cooling means from said crank shaft, means for lubricating andsealing supporting means'for said crank shaft in said crank case andmeans leading lubricant under vaporized operating medium pres'- sure tosaid engine piston crank shaft supporting means and moving parts of saidcondensed operating medium pump.V

13. A sun heat operatedgmotor comprising a heat absorber, a receiver, acasing in said receiver, a drum in said casing, tubes extending in saidcasing intermediate said casing and drum and opening in said receiver, aheat absorbing fluid, a pump for circulating said heat absorbing iiuidthrough said heat absorber, tubes and casing, an engine cylinder locatedin said drum and having ports opening therein, an exhaust duct, a.distributor controlling the timed communication of said cylinder portswith the space inside said drum and said exhaust duct, a pistonreciprocating in said cylinder, a piston rod, a crank case supportingsaid casing and drum and communicating with the s ace inside saidjournalled in said crank case, crank means on said crank shaft connectedwith said pistonrod and actuating said distributor, a condenserconnected with said exhaust duct, means for cooling said condenser, saidcrank case casing and drum'contaimng a lubricant and a superna-` tantbody of operating medium, a pump drawing condensed operating medium fromsaid condenser and conveying it to said crank,

case and casing and drum, means for actuating said heat absorbing fluidcirculating lubricant under the pressure of the vaporized operatingmedium from said receptacle to crank shaft supporting means in saidcrank case, means leading lubricant under the pressure of the saidvaporized operating iluld to said engine piston, said piston andcylinder having faces inclined towards said ports,

means for collecting lubricant leaking from said crank shaft supportingmeans, means for forcing said collected lubricant to said receptacle,means for introducing operating medium in said drum, means for detectingthe level ofsaid lubricant in said crank case and drum and meansforsupplying lubricant under the vaporized operating medium pressure tomoving parts of said condensed oper ating medium conveying pump Intestimony whereof I have signed my name to this specification.

TITO ROMAGNOLI. [n s.]

